Applied Research Of Pre-stack Time Migration Processing Technology On The Micro Faults In The Coalfield

Pre-stack time migration tech is a kind of method, which can apply for the condition of complex structures with less velocity change in landscape. Pre-stack time migration has take the place of convention post-stack migration becoming a kind of dominant technology when it comes to seismic exploration in coalfield. Department of production in coalfield already enlist the pre-stack migration in processing requirement. This paper based on the theory of pre-stack time migration with Kirchhoff integral, and does serials of research on micro fault in coalfield.First of all, this paper elaborating the meaning of migration, discussing the importance and the need to using in pre-stack time migration in coalfield micro fault earthquake exploration. Expounding the Kirchhoff pre-stack migration integral method, analysis the influence of pre-stack migration parameters to imagination. Secondly, by constructing a micro fault model and studying the forward modeling stimulation, compare a serious of experiments with the controls for each model with only one parameter by which the paper discusses the wave frequency and the relationship between micro geophone space and the task of improving the vertical resolution.Thirdly, by applying the a practical seismic data in coalfield which reveals the features of micro faults in seismic profile, analyzing and processing the preparation of pre-stack, such as observation system, de-noising before stack, static correction, and the influence of de-convolution parameter to the pre-stack migration imaging of micro default. And this paper takes some defaults as example, which was confirmed already. Then the thesis processes the data through which we discuss the influence of parameter of pre-stack time migration to the processing accuracy.At last, by combining the purpose and significance of this research, this paper objectively summarizes and evaluates the advantages of pre-stack time migration with other methods, the accuracy of micro defaults, pre-stack factors and migration parameters. parameters.